Effect of Electric Field on the Directly Electrospun Nanofiber Yarns: Simulation and Experimental Study

Shixin Jin,Binjie Xin,Yuansheng Zheng,Shuhua Liu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1

Electric field plays a key role in electrospinning process for nanofiber and nanofiber yarn producing. The electric field distribution of the yarn manufacturing system is simulated by using finite element method analysis. The effects of electric field distribution and intensity were studied to analyze the influence of the electric field on the electrospun nanofiber yarn surface morphology, mechanical, thermal and water absorption properties. The results show that the morphology anddiameters of nanofiber and yarn were obviously affected by the electric field with changing the needle distance and applied voltage, which further influence the mechanical performance of the yarn. The needle distance does not much affect the thermal property of the PSA electrospun yarn, whereas the yarn obtains better thermal resistance properties at voltage of 25 kV. The nanoyarn electrospun and assembled under higher applied voltage is proved to have a better wicking property in our research.

Characterization and Mechanism Analysis of Flexible Polyacrylonitrile-Based Carbon Nanofiber Membranes Prepared by Electrospinning

Miao Yu,Binjie Xin,Zhuoming Chen,Yan Liu 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

Carbon nanofiber membranes have a wide range of applications in energy and environmental fields with excellent thermal stability, electrical conductivity, and chemical resistance. Electrostatic spinning is a simple and effective technique to prepare nanofiber membranes; however, electrostatically spun carbon nanofiber membranes tend to be brittle, which is limiting the application of carbon nanofiber membranes. Herein, flexible carbon nanofiber (FCNF) membranes were prepared in this study by a simple procedure of electrostatic spinning, pre-oxidation, and carbonization. During the high-temperature carbonization process, tetra-butyl titanate (TBT) is transformed into TiO2 grains. The average diameter of FCNF rose with increasing the proportion of TBT. The stress–strain curves showed the best flexibility of FCNF-1.5. The grain size of TiO2 increased to 4.5 nm when carbonized at 1000 °C. TiO2 was shown to improve flexibility by relieving the stress concentration of cracks on the fiber surface, thus reducing the fracture of the produced FCNF.

Melt-Electrospun Polyvinylbutyral Bonded Polypropylene Composite Fibrous Mat: Spinning Process, Structure and Mechanical Property Study

Jinhao Xu,Fuli Zhang,Binjie Xin,Yuansheng Zheng,Chun Wang,Shixin Jin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7

In this study, a novel polyvinylbutyral (PVB) bonded polypropylene (PP) composite fibrous mat was fabricated viamelt-electrospinning. In order to enhance the structure stability and mechanical properties of pristine PP fibrous mat system,preparation and characterization of the composite fibrous material by mixing different percentages of PVB and PP wasdesigned. The PVB can form bonding point between the PP fibers, which can ease the slip phenomenon between strainedfibers. The structure, morphology, tensile and tearing stress were measured systematically. The resultants exhibited that thetensile stress and tearing strength of composite fibrous mats were increased from 30.13 to 43.73 kPa and from 0.07 to 0.5 N,respectively. Meanwhile, the straight jet length and whipping range of each electrospun jets were analyzed via the imagescaptured by a high-speed photography system during the spinning process. The experimental resultants depicted thatcomposite system can lead to longer straight jet length and smaller whipping range.

Preparation and Characterization of Carbonized Polyacrylonitrile/Keratin Nanofiber Mat

Chao Hou,Jia Yu,Binjie Xin 한국섬유공학회 2023 Fibers and polymers Vol.24 No.11

With the continuous development of flexible wearable technology, there is an increasing demand for new sensors that can accurately monitor and record human motion. Fiber mats have emerged as a promising material for use in flexible sensors. In this study, a fibrous mat consisting of carbonized polyacrylonitrile/keratin was designed for monitoring human motions using electrostatic spinning, high temperature pre-oxidation, and carbonization processes. The fiber mat exhibits excellent mechanical strength and flexibility. By measuring changes in the sensor resistance of the carbonized polyacrylonitrile/keratin fiber mat, it is possible to monitors the flatness and curvature of the finger with high precision, offering a new solution for the development of flexible wearable products. The carbonized polyacrylonitrile/keratin-based fiber mat has the advantages of flexibility, fast response, and high accuracy, and is a novel and promising sensing material with broad application prospects in the field of wearable technology.

Effect of Particle Size of Cellulose Nanofibril on the Structure and Property of Polyacrylonitrile (PAN) Membrane by Electrospinning

Wenlong Xu,Xue Yang,Binjie Xin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1

Polyacrylonitrile (PAN)/cellulose nanofibril (CNF) nanofiber membranes were successfully prepared by anelectrospinning method, in which the amount of CNF kept 1 wt%. The effects of CNF sizes on the morphology and propertyof spinning solutions and PAN electrospun nanofiber membrane were systematically investigated by rheological propertytest, conductivity test, SEM, TG, DSC, contact angle test and mechanical test. The results showed that the viscosity andconductivity of the spinning solution was improved with the increasing of CNF sizes, as the formation of the strong polarinteractions of nitrile groups and the hydroxyl groups between PAN and CNF. All the morphology of the PAN/CNF nanofibermembrane exhibited a uniform diameter with no visible beads or beads to the string structure, and the average diameter of thePAN/CNF nanofiber was decreased with the increasing of the CNF size. Moreover, the addition of CNF could improve thethermal stability, mechanical property, and hydrophilicity of the PAN membrane. And the PAN/CNF-10 nanofiber membraneexhibited the optimal properties.

Preparation and Properties of Functional Fabric Coating Based on SiO2-aerogel/Polyurethane

Lili Xu,Yan Liu,Binjie Xin,Yuanyuan Zhou 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7

The silane coupling agent modified SiO2 particles, multi aperture silica aerogel and waterborne polyurethaneacrylate (WPUA) were blended to produce resin coated fabrics with good thermal stability, to achieve excellent waterrepellency and a certain protective property. The thermal stability and water repellency of ordinary cotton could be improvedby the hydrophobic SiO2 particles, WPUA and silica aerogel (SA) powders on the fabric surface. Our experimental resultsillustrated that the thermal stability of the coated fabric was greatly improved by adding aerogels and silane modified SiO2,and the amount of residual carbon increased significantly at 600 °C as the corresponding residues of SA/WPUA coated fabricfinally could be 13.19 %. The water contact angle of the fabric was obviously increased after the silane modified SiO2particles mixed with SA/WPUA. It was found that the more aerogel added, the larger the contact angle was, and the contactangel reached about 120 ° when the aerogel was 4 wt%. It could be proved that the coated fabric had a certain surface selfcleaningeffect. The tensile tests characterized that the stress of the coated fabric reached the maximum value of 64 MPawhen the aerogel dosage was 2 wt%. Chemical resistance analysis suggested that the fabric had similar chemical resistanceafter the integration of porous aerogel particles. However, unlike most polyurethane coatings, the majority of chemicals wereadsorbed in aerogel coatings. The infrared spectrum of the coating samples showed that the coating surface was stable, whichwas attributed to the interfacial adhesion between cotton fiber and polyurethane adhesive. The appearance of aerogel andSiO2 particles dispersed on the fabric surface was analyzed by SEM. All outcomes indicated a significant improvement ingeneral properties of WPUA coatings by adding a handful of silica aerogel (0.5-4 wt %).

Fabrication and Characterization of Graphene Enriched Polysulfon Amide Nanocomposites by Electrospinning System

Na Meng,Yuansheng Zheng,Binjie Xin 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2

In this paper, we report on the fabrication and characterization of poly(sulfone amide)/graphene (PSA/G) nonwoven based nanocomposite mat assembled via electrospinning technique. Different types of nanocomposite mats were electrospun by varying the weight percentage of graphene in the polymer solution. The surface morphologies, chemical structural, thermal, and electrical properties of the nanocomposites were evaluated systematically. The morphology of the PSA/G nanocomposites exhibited that mesh-like ultrafine nanofibers were densely aligned. Thermal stability and electrical properties of the PSA/G composites could be improved obviously with the addition of graphene. And the thickness uniformity of the nanocomposite mat was improved by using an electrospinning system. Our experimental results suggested that the PSA/G nanocomposites have potential to serve in many different applications, especially in the area of electronic components.

Effects of Electric Filed on Electrospray Process: Experimental and Simulation Study

Xuan Dong,Yuansheng Zheng,Binjie Xin,Huaiyuan Liu,Lantian Lin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11

At present, there exists a widely-held view that electric field plays an extremely important role in the electrosprayprocess. Aimed at investigating into the effects of electric field distribution and intensity on the electrospray process andresultant microsphere diameter, a variety of necessary and relevant tests were performed in this study by inviting an auxiliaryelectrode ring. The three-dimensional electric fields of the electrospray system were simulated, in addition, high-speedphotography was adopted to recognize the electrospray modes. The results of a series of electrospray experiments demonstratedthat not only electrospray mode but also resultant microsphere diameters are influenced, to a considerable degree, by the electricfield. Such simulation results were verified by above-mentioned experiments that from higher electric field intensity comessmaller microsphere diameter, due to the fission caused by the surface charge, and besides, more uniform electric fielddistribution produces more uniform microsphere diameter.

Characterization and Mechanism Analysis of Flexible UV Irradiated PAN-Based Carbon Fiber Membranes Prepared

Chao Hou,Miao Yu,Binjie Xin 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

To enhance the flexibility of electrostatically spun PAN-based carbon nanofiber films for wearable textile applications, this study aimed to prepare PAN nanofiber films by incorporating the 1173 photoinitiator. Subsequently, UV irradiation, pre-oxidation treatment, and high-temperature carbonization processes were employed to develop PAN nanofiber films with improved mechanical properties. The results indicated that UV irradiation treatment significantly promoted the degree of pre-oxidation reaction in PAN nanofiber membranes. Thermal performance characterization demonstrated that UV irradiation reduced the initiation temperature of the cyclization reaction and mitigated the concentration of exothermic phenomena. Raman spectra analysis revealed increased graphitization in the carbon nanofiber film following UV irradiation, as evidenced by a decrease in the ID/IG value to 0.908. This suggests that UV irradiation facilitated stable carbonization and enhanced the graphitization of the carbon fiber within PAN nanofiber films. Moreover, the stress–strain curve indicated that the breaking strength of the nanofiber film reached 1.45 MPa after 20 min of UV irradiation while maintaining an elongation at a break of 3.5%, demonstrating its remarkable strength and toughness. The resulting flexible carbon nanofiber film holds great potential for medical textiles, filtration membranes, flexible capacitors, and more applications.

MXene/PVA Fiber-based Supercapacitor with Stretchability for Wearable Energy Storage

Wenjie Yu,Yu Li,Binjie Xin,Zan Lu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11

MXene fiber-based supercapacitor exhibits a great potential for wearable energy storage devices with a largesurface area, good conductive, and higher power density. However, MXene flakes are difficult to spin independently due tothe non-liquid crystal structure. In the report, we fabricated freestanding MXene/PVA fibers with good stretchability andimpressive electrochemical properties for fiber-based supercapacitors by a simple wet spinning method. The tensile strengthof the MXene/PVA fibers is significantly enhanced compared with pure PVA fibers for the concentration of MXene foraround 5-20 wt.%. The elongation of the MXene/PVA fiber can reach 48 %, even if the MXene concentration increase to25 wt.%. MXene flakes also increase the thermal stability of hybrid fibers compared with pure PVA fibers. MXene/PVAfiber-based supercapacitors act as efficient energy storage devices, which display high gravimetric capacitance (119.3 F g-1),and areal capacitance (130.9 mF cm-2), strong durability in multiple mechanical states, and steady electrochemical behaviorafter stretching.